/**
 * Copyright 2012 Netflix, Inc.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.yxy.springcloud.framework.microservice1.hystrixTest;

import static org.junit.Assert.*;

import java.util.concurrent.Future;

import org.junit.Test;

import rx.Observable;
import rx.Observer;
import rx.functions.Action1;

import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;

/**
 * The obligatory "Hello World!" showing a simple implementation of a {@link HystrixCommand}.
 */
public class CommandHelloWorld extends HystrixCommand<String> {

  private final String name;

  public CommandHelloWorld(String name) {
    super(HystrixCommandGroupKey.Factory.asKey("ExampleGroup"));
    this.name = name;
  }

  @Override
  protected String run() {
    return "Hello " + name + "!";
  }

  public static class UnitTest {

    @Test
    public void testSynchronous() {
      assertEquals("Hello World!", new CommandHelloWorld("World").execute());
      assertEquals("Hello Bob!", new CommandHelloWorld("Bob").execute());
    }

    @Test
    public void testAsynchronous1() throws Exception {
      assertEquals("Hello World!", new CommandHelloWorld("World").queue().get());
      assertEquals("Hello Bob!", new CommandHelloWorld("Bob").queue().get());
    }

    @Test
    public void testAsynchronous2() throws Exception {

      Future<String> fWorld = new CommandHelloWorld("World").queue();
      Future<String> fBob = new CommandHelloWorld("Bob").queue();

      assertEquals("Hello World!", fWorld.get());
      assertEquals("Hello Bob!", fBob.get());
    }

    @Test
    public void testObservable() throws Exception {

      Observable<String> fWorld = new CommandHelloWorld("World").observe();
      Observable<String> fBob = new CommandHelloWorld("Bob").observe();

      // blocking
      assertEquals("Hello World!", fWorld.toBlocking().single());
      assertEquals("Hello Bob!", fBob.toBlocking().single());

      // non-blocking
      // - this is a verbose anonymous inner-class approach and doesn't do assertions
      fWorld.subscribe(new Observer<String>() {

        @Override
        public void onCompleted() {
          // nothing needed here
        }

        @Override
        public void onError(Throwable e) {
          e.printStackTrace();
        }

        @Override
        public void onNext(String v) {
          System.out.println("onNext: " + v);
        }

      });

      // non-blocking
      // - also verbose anonymous inner-class
      // - ignore errors and onCompleted signal
      fBob.subscribe(new Action1<String>() {

        @Override
        public void call(String v) {
          System.out.println("onNext: " + v);
        }

      });

      // non-blocking
      // - using closures in Java 8 would look like this:

      //            fWorld.subscribe((v) -> {
      //                System.out.println("onNext: " + v);
      //            })

      // - or while also including error handling

      //            fWorld.subscribe((v) -> {
      //                System.out.println("onNext: " + v);
      //            }, (exception) -> {
      //                exception.printStackTrace();
      //            })

      // More information about Observable can be found at https://github.com/Netflix/RxJava/wiki/How-To-Use

    }
  }

}
